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Old 11-12-2014, 12:20 AM
BarelyAWake's Avatar
BarelyAWake BarelyAWake is offline
Motorized Bicycle Elite Member
Join Date: Jul 2009
Location: Maine
Posts: 7,212
Default Re: bottom bracket jackshaft

Keeping in mind not all bottom brackets are the same - I used 499502HNR sealed bearings w/snap rings (5/8" ID x 1-3/8" OD, same as the shift kits) & after lightly honing down the threads in the BB they pressed right in. Add a 5/8" keyed shaft, "BMX" freewheel, threaded freewheel adapter, lock collars & 5/8" keyed sprockets of your choice;

pedal driven:
engine driven:

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